EP2772964B1 - Sekundärbatterie mit neuartiger struktur - Google Patents

Sekundärbatterie mit neuartiger struktur Download PDF

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Publication number
EP2772964B1
EP2772964B1 EP13746261.0A EP13746261A EP2772964B1 EP 2772964 B1 EP2772964 B1 EP 2772964B1 EP 13746261 A EP13746261 A EP 13746261A EP 2772964 B1 EP2772964 B1 EP 2772964B1
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EP
European Patent Office
Prior art keywords
cathode
metal layer
anode
lead
secondary battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP13746261.0A
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English (en)
French (fr)
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EP2772964A1 (de
EP2772964A4 (de
Inventor
Kyung Su Oh
Cha-Hun Ku
Sung Jong Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Chem Ltd
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LG Chem Ltd
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Publication date
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Priority claimed from KR1020120012341A external-priority patent/KR20130091086A/ko
Priority claimed from KR1020120015088A external-priority patent/KR101326082B1/ko
Application filed by LG Chem Ltd filed Critical LG Chem Ltd
Publication of EP2772964A1 publication Critical patent/EP2772964A1/de
Publication of EP2772964A4 publication Critical patent/EP2772964A4/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H01M4/662—Alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/171—Lids or covers characterised by the methods of assembling casings with lids using adhesives or sealing agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • an existing anode lead is made of a single material such as nickel and has a single size.
  • a material having a lower resistance than that of nickel, such as copper may be used as the anode lead, but is not suitable because it is difficult to secure processability for welding to an electrode foil or can.
  • the inventors of the present invention confirmed that, when at least one of a cathode lead attached to a cathode uncoated portion and an anode lead attached to an anode uncoated portion includes a first metal layer used for coupling with an electrode uncoated portion and/or a battery case and a second metal layer having a lower resistance than that of the first metal layer, wherein the first and second metal layers are coupled to each other, resistance and heat generation may be reduced by the second metal layer having a relatively low resistance while a secondary battery is used, thus completing the present invention.
  • the secondary battery may have a structure in which a winding start portion of the cathode has cathode active material coated portions formed at upper and lower sides of the cathode current collector and thus does not have a cathode uncoated portion, only a winding end portion of the cathode is provided with a cathode uncoated portion at which the cathode lead is installed, a cathode active material coated portion is further formed at at least one surface of an end portion of the cathode uncoated portion, and an insulation tape is provided at a boundary surface of the cathode active material coated portion located at the winding end portion of the cathode and facing the anode.
  • a material of the insulation tape is not particularly limited so long as such material has excellent insulating properties and may be, for example, a material that is not thermally shrinkable at a temperature of up to 200°C.
  • the insulation tape is made of a material that is shrunken to some extent by heat, problems caused in a separator disposed between electrodes may be addressed.
  • the amount of Cu in the alloy may be between 80 and 99.9% and the amount of Ni in the alloy may be between 0.1 and 20%.
  • the binder is a component assisting in binding between the active material and the conductive material and in binding of the active material to the cathode current collector.
  • the binder is typically added in an amount of 1 to 30 wt% based on the total weight of the mixture including the cathode active material.
  • the separator is disposed between the cathode and the anode and, as the separator, an insulating thin film having high ion permeability and mechanical strength is used.
  • the separator typically has a pore diameter of 0.01 to 10 ⁇ m and a thickness of 5 to 300 ⁇ m.
  • sheets or non-woven fabrics made of an olefin polymer such as polypropylene, glass fibers or polyethylene, which have chemical resistance and hydrophobicity are used.
  • a solid electrolyte such as a polymer
  • the solid electrolyte may also serve as both the separator and electrolyte.
  • the non-aqueous organic solvent may be an aprotic organic solvent such as N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma butyrolactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethylsulfoxide, 1,3-dioxolane, formamide, dimethylformamide, dioxolane, acetonitrile, nitromethane, methyl formate, methyl acetate, phosphoric acid triester, trimethoxy methane, dioxolane derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbonate derivatives, tetrahydrofuran derivatives, ether, methyl propionate, or ethyl propionate.
  • the lithium salt is a material that is readily soluble in the non-aqueous electrolyte and examples thereof include LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate, and imide.
  • Welding of the electrode lead to a current collector may be performed using various methods, for example, arc welding, ultrasonic welding, resistance welding, and the like.
  • ultrasonic welding is a welding method using vibration generated through application of ultrasonic waves while applying pressure to materials to be welded and is performed such that impurities and the like present between the pressurized materials are removed by high-frequency vibration energy generated by ultrasonic waves of about 20 KHz and a gap between the materials to be welded is reduced to an interatomic distance.
  • the secondary battery according to the present invention includes the electrode lead having a lower resistance than that of an electrode lead of a conventional secondary battery, the secondary battery is suitable for use in power tools.
  • FIG. 3 is a partial horizontal sectional view of a jelly-roll type electrode assembly 200 according to an embodiment of the present invention prior to winding thereof.
  • FIG. 4 is a perspective view of a cathode lead and an anode lead of FIG. 3 .
  • first metal layer (a)-a second metal layer (b)-a first metal layer (c), and the like may be used.
  • the first metal layer (a) and the first metal layer (c) may have different components, thicknesses, widths, and the like.
  • a winding start portion of a cathode 252 has cathode active material coated portions 220a and 220b on both upper and lower surfaces of a cathode current collector 258 and thus does not include a cathode uncoated portion and only a winding end portion of the cathode 252 includes a cathode uncoated portion 258' for installation of a cathode lead 214.
  • insulation tapes 216a and 216b are located at the winding end portion of the cathode 252 and are attached to boundary surfaces of the respective cathode active material coated portions 220a facing an anode 254.
  • the anode 254 includes anode active material coated portions 240a and 240b on opposite surfaces of an anode current collector 256, and a winding end portion of the anode current collector 256 includes an anode uncoated portion 256' which is not coated with an anode active material.
  • an anode lead 212 for connection to an external terminal is connected to the anode uncoated portion 256'.
  • the anode active material coated portion 240a which is a winding end portion, on an upper surface of the anode current collector 256 contacts an boundary surface of the cathode active material coated portion 220b on the lower surface of the cathode current collector 258 at which the cathode lead 214 is installed, with the separator 242a disposed therebetween.
  • the insulation tape 216b is further attached to the boundary surface of the cathode active material coated portion 220b and thus short circuit between the anode active material coated portion 240a and the cathode uncoated portion 258', which is not coated with the cathode active material, is prevented.
  • a winding start portion of the cathode 252 has cathode active material coated portions 219c and 219d on upper and lower surfaces of the cathode current collector 258 and thus does not include a cathode uncoated portion, and only a winding end portion of the cathode 252 includes a cathode uncoated portion for installation of the cathode lead 214.
  • cathode active material coated portions 217a and 217b are formed on opposite surfaces of an end portion of the cathode uncoated portion, and a second insulation tape 219a is attached to an upper surface of the cathode active material coated portion 217a and a second insulation tape 219b is attached to a lower surface of the cathode active material coated portion 217b.
  • first insulation tapes 216a and 216b are respectively attached, at the winding end portion of the cathode 252, to boundary surfaces of the respective cathode active material coated portions 219c and 219d facing the anode 254.
  • At least one of a cathode lead coupled to a cathode uncoated portion and an anode lead coupled to an anode uncoated portion includes a first metal layer used for coupling with an electrode uncoated portion and/or coupling with a battery case and a second metal layer having a relatively lower resistance than that of the first metal layer, wherein the first and second metal layers are coupled to each other, and thus, the electrode lead provides predetermined bonding strength to the electrode uncoated portion or the battery case and resistance at an electrode lead portion and generation of heat therefrom during use of the secondary battery may be significantly reduced.
  • the electrode lead of the secondary battery consists of an alloy including Cu, Ni, or the like. As such, since the electrode lead includes Cu having low electrical resistance, Ni exhibiting high bonding strength properties, or the like, operating characteristics of the secondary battery during charge/discharge may be enhanced and excellent manufacturing processability may be provided.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Claims (8)

  1. Sekundärbatterie, in welcher eine Elektrodenanordnung vom Jelly-Roll-Typ ("Jelly-Roll"), in welcher eine Kathode, umfassend einen mit einem Kathodenaktivmaterial beschichteten Abschnitt an wenigstens einer Fläche eines Kathodenstromkollektors, eine Anode, umfassend einen mit einem Anodenaktivmaterial beschichteten Abschnitt an wenigstens einer Fläche eines Anodenstromkollektors, und ein dazwischen angeordneter Separator gewickelt sind, und ein Elektrolyt in einem Batteriegehäuse untergebracht sind, und
    wenigstens eine aus einer Kathodenleitung, welche mit einem unbeschichteten Kathodenabschnitt gekoppelt ist, und einer Anodenleitung, welche mit einem unbeschichteten Anodenabschnitt gekoppelt ist, eine erste Metallschicht, welche zum Koppeln mit einem unbeschichteten Elektrodenabschnitt und/oder zum Koppeln mit dem Batteriegehäuse verwendet wird, und eine zweite Metallschicht umfasst, welche einen relativ niedrigeren Widerstand als denjenigen der ersten Metallschicht aufweist, wobei die erste und die zweite Metallschicht miteinander gekoppelt sind,
    wobei die zweite Metallschicht einen Widerstand von 10 bis 70% desjenigen der ersten Metallschicht aufweist,
    wobei ein Wicklungsstartabschnitt der Kathode mit einem Kathodenaktivmaterial beschichtete Abschnitte an einer oberen und einer unteren Fläche des Kathodenstromkollektors aufweist und somit keinen unbeschichteten Kathodenabschnitt umfasst, nur ein Wicklungsendabschnitt der Kathode einen unbeschichteten Kathodenabschnitt zur Installation der Kathodenleitung umfasst und ein Isolierband an einer Grenzfläche des mit einem Kathodenaktivmaterial beschichteten Abschnitts bereitgestellt ist, welche an dem Wicklungsendabschnitt der Kathode lokalisiert ist und der Anode zugewandt ist, und
    wobei die erste Metallschicht und die zweite Metallschicht eine Kombination aus einer Ni-Schicht und einer Ag-Schicht sind.
  2. Sekundärbatterie nach Anspruch 1, wobei das Batteriegehäuse eine zylindrische Dose ist.
  3. Sekundärbatterie nach Anspruch 1, wobei die erste Metallschicht mit dem unbeschichteten Elektrodenabschnitt oder dem Batteriegehäuse durch Schweißen gekoppelt ist.
  4. Sekundärbatterie nach Anspruch 1, wobei die erste und die zweite Metallschicht durch eine heterogene Materialverbindung miteinander verbunden sind und die heterogene Materialverbindung Wärmeschmelzen, Walzen, chemische Adhäsion, Laserschweißen, Punktschweißen, Plattieren oder Beschichten ist.
  5. Sekundärbatterie nach Anspruch 1, wobei erste Metallschichten jeweils mit entgegengesetzten Seitenflächen der zweiten Metallschicht gekoppelt sind.
  6. Sekundärbatterie nach Anspruch 1, wobei die Kathodenleitung oder die Anodenleitung eine Dicke von 0,05 bis 0,15 mm aufweist;
    die erste Metallschicht die gleiche Dicke wie diejenige der zweiten Metallschicht aufweist; und
    die erste Metallschicht die gleiche Breite wie diejenige der zweiten Metallschicht aufweist.
  7. Sekundärbatterie nach Anspruch 1, wobei ein mit einem Kathodenaktivmaterial beschichteter Abschnitt ferner an wenigstens einer Fläche eines Endabschnitts des unbeschichteten Kathodenabschnitts ausgebildet ist.
  8. Kraftbetriebenes Werkzeug, umfassend die Sekundärbatterie nach Anspruch 1 als eine Energiequelle.
EP13746261.0A 2012-02-07 2013-01-17 Sekundärbatterie mit neuartiger struktur Active EP2772964B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020120012341A KR20130091086A (ko) 2012-02-07 2012-02-07 신규한 구조의 이차전지
KR1020120015088A KR101326082B1 (ko) 2012-02-15 2012-02-15 낮은 저항과 우수한 제조 공정성의 전극 탭을 포함하는 이차전지
PCT/KR2013/000358 WO2013118982A1 (ko) 2012-02-07 2013-01-17 신규한 구조의 이차전지

Publications (3)

Publication Number Publication Date
EP2772964A1 EP2772964A1 (de) 2014-09-03
EP2772964A4 EP2772964A4 (de) 2015-11-11
EP2772964B1 true EP2772964B1 (de) 2019-01-09

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EP13746261.0A Active EP2772964B1 (de) 2012-02-07 2013-01-17 Sekundärbatterie mit neuartiger struktur

Country Status (5)

Country Link
US (1) US8895169B2 (de)
EP (1) EP2772964B1 (de)
JP (1) JP6008981B2 (de)
CN (1) CN103988339A (de)
WO (1) WO2013118982A1 (de)

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Also Published As

Publication number Publication date
WO2013118982A1 (ko) 2013-08-15
US20140072851A1 (en) 2014-03-13
CN103988339A (zh) 2014-08-13
JP2015506085A (ja) 2015-02-26
US8895169B2 (en) 2014-11-25
EP2772964A1 (de) 2014-09-03
JP6008981B2 (ja) 2016-10-19
EP2772964A4 (de) 2015-11-11

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